Electronic apparatus with a detachable cooling device

ABSTRACT

An electronic apparatus having a detachable cooling device is disclosed. The electronic apparatus includes a portable information device having a heating body contained therein. The portable information device also includes a heat sink disposed on a bottom surface of the portable information device and thermally connected to the heating body. The detachable cooling device includes a mount surface on which the bottom surface of the portable information device is mounted, a heat-receiving heat sink disposed on the mount surface and thermally connected to the heat sink, and an up-and-down mechanism that moves the heat-receiving heat sink towards the heat sink and causes the heat-receiving heat sink to contact the heat sink when the portable information device is mounted on the mount surface.

PRIORITY CLAIM

The present application claims benefit of priority under 35 U.S.C. § §120, 365 to the previously filed Japanese Patent Application No.JP2015-238326 with a priority date of Dec. 7, 2015, which isincorporated by reference herein.

TECHNICAL FIELD

The present invention relates to electronic apparatus in general, and inparticular to a cooling device for cooling a portable informationdevice.

BACKGROUND

A portable information device having a lightweight and compact design inconsideration of portability often has limited functions. For example, anotebook personal computer (laptop PC) typically has limited functionsin order to reduce its weight. Thus, there are limitations in increasingthe size and performance of a cooling function of reducing heatgeneration from a CPU or other devices mounted on a laptop PC andserving as an internal heating body of the laptop PC.

A cooling device that includes a heat sink can be thermally connected toa heat sink exposed at the bottom surface of a laptop PC when the laptopPC is mounted on and connected to the cooling device, and can enhance acooling function of the laptop PC. With this configuration, the heatsink of the laptop PC and the heat sink of the cooling device have pinsupport shapes to increase a contact surface area therebetween andobtain a sufficient heat transfer area. However, sometimes the heatsinks of the laptop PC and the cooling device are not contacted to eachother sufficiently, which leads to the possibility of a considerableloss of heat transfer.

Consequently, it would be desirable to provide an improved coolingdevice for cooling a portable information device such as a laptop PC.

SUMMARY

In accordance with an embodiment of the present disclosure, a portableinformation device includes a heating body; and a cooling devicedetachably connected to the portable information device and configuredto absorb heat from the heating body. The portable information deviceincludes a heat-dissipation heat sink disposed on a bottom surface ofthe portable information device and thermally connected to the heatingbody. The cooling device includes a mount surface on which the bottomsurface of the portable information device is mounted, a heat-receivingheat sink disposed on the mount surface and thermally connected to theheat-dissipation heat sink, and an up-and-down mechanism that elevatesthe heat-receiving heat sink towards the heat-dissipation heat sink tobring the heat-receiving heat sink into a pressure contact with theheat-dissipation heat sink when the portable information device ismounted on the mount surface.

All features and advantages of the present disclosure will becomeapparent in the following detailed written description.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention itself, as well as a preferred mode of use, furtherobjects, and advantages thereof, will best be understood by reference tothe following detailed description of an illustrative embodiment whenread in conjunction with the accompanying drawings, wherein:

FIG. 1 illustrates an electronic apparatus according to an embodiment ofthe present invention;

FIG. 2 is a partial cross-sectional side view illustrating a state inwhich the cooling device and a portable information device from FIG. 1are connected to each other;

FIG. 3 is a partial cross-sectional side view illustrating across-section different from that illustrated in FIG. 2;

FIG. 4 is a bottom view illustrating a bottom surface of the portableinformation device from FIG. 1;

FIG. 5 shows an internal configuration of the cooling device;

FIG. 6 is an enlarged side view illustrating a main portion of theinternal configuration of the cooling device;

FIG. 7A is a cross-sectional view of an on/off sensor in a state inwhich the portable information device is not mounted on a mount surface;

FIG. 7B is a cross-sectional view of an on/off sensor in a state inwhich the portable information device is mounted on a mount surface;

FIG. 8A is a cross-sectional view of an on sensor and an off sensor in astate in which the portable information device is not mounted on a mountsurface;

FIG. 8B is a cross-sectional view of an on sensor and an off sensor in astate in which the portable information device is mounted on a mountsurface;

FIG. 9A is a bottom view of an internal configuration of the portableinformation device in a state in which apparatus shutter members areclosed;

FIG. 9B is a bottom view of an internal configuration of the portableinformation device in a state in which apparatus shutter members areopen;

FIG. 10 is a plan view illustrating a state in which a slide membermoves forward from the state illustrated in FIG. 5 so that the apparatusshutter member is open;

FIG. 11 is a plan view illustrating a state in which an up-and-downslide member moves forward from the state illustrated in FIG. 10 so thata heat-receiving heat sink is elevated;

FIG. 12 is a plan view illustrating a state in which an ejecting buttonis operated from the state illustrated in FIG. 11;

FIG. 13 is an enlarged side view of a main portion illustrating a statein which the heat-receiving heat sink is elevated from the stateillustrated in FIG. 6; and

FIG. 14 is an enlarged side view of a main portion illustrating a statein which an external screw member is screwed into an internal screw holefrom the state illustrated in FIG. 13.

DETAILED DESCRIPTION

FIG. 1 is a perspective view illustrating an electronic apparatus 10according to an embodiment of the present invention in which a coolingdevice 11 and a portable information device 12 are separated from eachother. FIG. 2 is a partial cross-sectional side view illustrating astate in which the cooling device 11 and the portable information device12 illustrated in FIG. 1 are connected to each other. FIG. 3 is apartial cross-sectional view illustrating a cross-section different fromthat illustrated in FIG. 2. FIG. 4 is a bottom view of a bottom surface16 a of the portable information device 12 illustrated in FIG. 1. In theelectronic apparatus 10 according to the present embodiment, theportable information device 12 that is a laptop PC is mounted on andconnected to the cooling device 11 that is an extension device so thatthe cooling function of the portable information device 12 can beenhanced and a processing function, a power supply function, and aconnection function with respect to peripheral equipment and a networkcan be extended and enhanced. The portable information device 12 may be,of course, a device except a laptop PC, and may be, for example, atablet personal computer (tablet PC) or a smartphone each having nophysical keyboard.

First, an overall configuration of the electronic apparatus 10 will bedescribed.

As illustrated in FIG. 1, the portable information device 12 is of aclamshell type in which a display chassis 18 is coupled to a bodychassis 16 to be freely opened and closed. A keyboard 20 is disposed onthe top surface of the body chassis 16, and a display 22 is provided onthe front surface of the display chassis 18.

As illustrated in FIGS. 2 and 4, the bottom surface 16 a of the bodychassis 16 is provided with an apparatus connector 25 electricallyconnected to an extension connector 24 of the cooling device 11 andapparatus shutter members 27 and 28 covering an opening 26 formed in thebottom surface 16 a to freely cover and uncover the opening 26. Aheat-dissipation heat sink 29 is disposed in the opening 26 and coveredwith the apparatus shutter members 27 and 28 to be freely covered anduncovered. As illustrated in FIG. 3, the bottom surface 16 a of the bodychassis 16 has an engaging hole 31 configured to be engaged with anengaging lever 30 projecting from the cooling device 11. FIG. 2illustrates a cross-sectional shape taken along a line passing throughthe connectors 24 and 25. FIG. 3 illustrates a cross-sectional shapetaken along a line passing through the engaging lever 30 and theengaging hole 31.

The apparatus connector 25 is connected to an unillustrated board housedin the body chassis 16 of the portable information device 12. Theheat-dissipation heat sink 29 is configured to extend a cooling functionof the portable information device 12 when contacting the heat-receivingheat sink 32 of the cooling device 11. The heat-dissipation heat sink 29and the heat-receiving heat sink 32 are thermally connected to eachother so that heat generated in the portable information device 12 istransferred to the cooling device 11 and dissipated to the outside. Theapparatus shutter members 27 and 28 prevent the heat-dissipation heatsink 29 that becomes hot from being always exposed at the bottom surface16 a of the portable information device 12.

As illustrated in FIGS. 1-3, the cooling device 11 is used with the bodychassis 16 of the portable information device 12 mounted on the coolingdevice 11, and includes a device chassis 33 made of a synthetic resinmaterial or a metal material and provided with a PC mount part 34 and alocking operation part 36.

The PC mount part 34 has a box shape having a top surface that is largeenough to allow the portable information device 12 to be mounted on thetop surface of the PC mount part 34. The PC mount part 34 includes amount surface 34 a which is tilted to have its height gradually increasefrom the front to the rear and on which the bottom surface 16 a of theportable information device 12 is placed and a refuge surface 34 b thatis recessed at the rear of the mount surface 34 a. The refuge surface 34b is a lower portion for avoiding an unillustrated battery or anotherobject that possibly projects from a rear lower surface of the portableinformation device 12.

The locking operation part 36 is a rectangular solid part whose heightis larger than that of the PC mount part 34, and is disposed at a sideand the rear of the PC mount part 34 (at a side of the refuge surface 34b). The locking operation part 36 includes the ejecting button 37 and anunillustrated key insertion hole. The ejecting button 37 is an operatingbutton that is operated when the portable information device 12 mountedon and connected to the cooling device 11 is detached. The key insertionhole is a hole for inserting a wired locking key (not shown) for theportable information device 12. When the locking key is inserted intothe key insertion hole to perform locking, an input operation to theejecting button 37 becomes invalid. In this manner, detachment of theportable information device 12 from the cooling device 11 is avoided toprevent theft of the portable information device 12.

On the mount surface 34 a, disposed are the extension connector 24 and adevice shutter member 40 covering an opening 38 (see FIG. 6) formed inthe mount surface 34 a so that the opening 38 is freely covered anduncovered. The heat-receiving heat sink 32 is disposed in the opening 38and covered with the device shutter member 40 to be freely covered anduncovered.

The extension connector 24 is connected to, for example, anunillustrated board housed in the PC mount part 34, and projects fromthe mount surface 34 a. The extension connector 24 constitutes aconnection terminal of each extension function provided in the coolingdevice 11, and is connected to the apparatus connector 25 provided onthe bottom surface 16 a of the portable information device 12.Connection of the apparatus connector 25 to the extension connector 24electrically connects the cooling device 11 and the portable informationdevice 12 so that the extension functions provided in the cooling device11 can be used by using the portable information device 12.

The engaging lever 30 projects from each of the left and right sides ofthe extension connector 24, and has its top exposed at the mount surface34 a. A guide post 41 having a U shape in plan projects to surroundthree sides: front, left, and right, of each engaging lever 30. Inconnecting the portable information device 12 to the cooling device 11,the guide post 41 is inserted together with the engaging lever 30 intothe engaging hole 31 of the portable information device 12, and thus,serves as a positioning pin for positioning the portable informationdevice 12 relative to the device chassis 33. An ejecting member 42 isprovided at a side of each guide post 41 on the mount surface 34 a. Indetaching the portable information device 12 from the cooling device 11,the ejecting member 42 elevates after disengagement of the engaginglever 30 from the engaging hole 31, and then lifts the bottom surface 16a of the portable information device 12.

A cooling structure of the electronic apparatus 10 will be described.

First, a cooling structure of the cooling device 11 is described. FIG. 5is a plan view of the cooling device 11. FIG. 6 is an enlarged side viewillustrating a main portion of the internal configuration of the coolingdevice 11.

As illustrated in FIG. 1, the cooling device 11 includes a water coolingunit 48 in which a radiator 44, a heat-receiving heat sink 32, and acirculating pump 46 are connected to one another in a loop by pipes 47so that cooling water circulates.

The heat-receiving heat sink 32 is a stepped rectangular plate membermade of a metal material having a high thermal conductivity, such ascopper or aluminum. The heat-receiving heat sink 32 is connected to aninlet pipe 47 and an outlet pipe 47, and cooling water is distributed incooling water distribution space in which unillustrated fins aredisposed. This cooling water distribution space is defined at the innerside of a thin lid body constituting an upper surface of theheat-receiving heat sink 32. The fins are arranged in parallel withpredetermined intervals in the cooling water distribution space with endfaces of the fins being in contact with the inner surface of the lidbody. In this manner, the heat-receiving heat sink 32 has a watercooling jacket structure that exchanges heat between the fins andcooling water by distribution of the cooling water around the fins inthe cooling water distribution space. In the water cooling unit 48having such a structure, cooling water that has also dissipated heatwith air supply by an unillustrated fan in the radiator 44 is introducedinto the heat-receiving heat sink 32 through the circulating pump 46.Cooling water that has collected heat of the heat-dissipation heat sink29 in the heat-receiving heat sink 32 is introduced into the radiator 44again. In this manner, the heat-receiving heat sink 32 can cool theheat-dissipation heat sink 29 with a high cooling efficiency.

As illustrated in FIGS. 5-6, the cooling device 11 includes, in thedevice chassis 33, a shutter driving mechanism 50, an up-and-downmechanism 52, and an apparatus ejecting mechanism 54.

The shutter driving mechanism 50 is a mechanism part that drives openingand closing of the apparatus shutter members 27 and 28 and the deviceshutter member 40. As illustrated in FIG. 5, the shutter drivingmechanism 50 includes a first motor 56, a slide link 57, a slide member58, an apparatus shutter operating member 59, and a device shutteroperating member 60.

The first motor 56 is an electric motor having an output shaft 56 acoupled to a ball screw mechanism 62 through a gear mechanism 61. Theball screw mechanism 62 extends laterally, and the slide link 57 isexternally fitted to the ball screw mechanism 62. When a driving forceis transmitted from the first motor 56 to the ball screw mechanism 62through the output shaft 56 a and the gear mechanism 61, the ball screwmechanism 62 is driven to rotate so that the slide link 57 moveslaterally.

The slide link 57 is a block member that is movable laterally along theball screw mechanism 62. A pressing part 57 a projects from a rear sidesurface of the slide link 57. A front side surface of the slide link 57is coupled to an end of the slide member 58.

The slide member 58 is a rod member that extends laterally, and isslidable laterally on the inner surface of the device chassis 33. Theslide member 58 is provided with a first rack gear 58 a disposed closeto an end of the slide member 58 and a second rack gear 58 b disposedclose to the other end of the slide member 58, relative to the center ofthe slide member 58 in the longitudinal direction. The first rack gear58 a is engaged with a first pinion gear 59 a provided integrally andcoaxially with the apparatus shutter operating member 59 at an initialposition (unattached state) illustrated in FIG. 5. The second rack gear58 b is engaged with a second pinion gear 63 at the initial positionillustrated in FIG. 5. The second pinion gear 63 is engaged with anopening/closing rack gear 60 a provided in the device shutter operatingmember 60.

The apparatus shutter operating member 59 is a short rod memberrotatably and pivotally supported on an on sensor (detection unit) 64described later. As illustrated in FIGS. 1 and 8A-8B, the apparatusshutter operating member 59 projects from an upper surface of the onsensor 64 that projects from the mount surface 34 a. The apparatusshutter operating member 59 is rotatably and pivotally supported on theon sensor 64 to be movable relative to the on sensor 64 in an axialdirection. The first pinion gear 59 a is disposed at a lower end of ashaft part 59 b of the apparatus shutter operating member 59 and isprovided integrally and coaxially with the shaft part 59 b. When theslide member 58 moves laterally, the first pinion gear 59 a rotatesabout the shaft part 59 b with the first rack gear 58 a interposedtherebetween. In this manner, the apparatus shutter operating member 59also rotates about the shaft part 59 b to rotate an opening/closing gear(opening/closing member) 65 (see FIG. 9) described later of the portableinformation device 12 so that the apparatus shutter members 27 and 28move laterally to be open or closed.

The device shutter operating member 60 is coupled to a side of thedevice shutter member 40. When the slide member 58 moves laterally, thesecond pinion gear 63 is caused to rotate through the second rack gear58 b. In this manner, the device shutter operating member 60 is causedto move laterally through the opening/closing rack gear 60 a so that thedevice shutter member 40 laterally moves to be open or closed.

The up-and-down mechanism 52 is a mechanism part that drives theheat-receiving heat sink 32 to move up and down. As illustrated in FIGS.5 and 6, the up-and-down mechanism 52 includes the first motor 56 sharedby the shutter driving mechanism 50, a base plate 66, and an up-and-downslide member 67.

The base plate 66 is a plate member whose outer shape is larger thanthat of the heat-receiving heat sink 32 in plan. The base plate 66elastically supports the heat-receiving heat sink 32 through a set ofcoil springs (elastic bodies) 68 disposed on an upper surface of thebase plate 66. The base plate 66 is hung on a lower surface opposite tothe mount surface 34 a serving as an upper surface of the device chassis33. Specifically, support bars 69 hung on the lower surface opposite tothe mount surface 34 a penetrate the base plate 66 in the thicknessdirection, and are retained by large-diameter parts 69 a at the lowerends of the support bars 69 to stop disconnection. Coil springs 70 areexternally fitted to the support bars 69. The base plate 66 is alwaysbiased downward by the coil springs 70 to be pressed against thelarge-diameter part 69 a, thereby preventing a backlash in, for example,carrying the cooling device 11.

Ribbed pressure-receiving members 71 each having a slope 71 a that tiltsupward toward the up-and-down slide member 67 (to the left in FIGS. 5and 6) are provided on a lower surface of the base plate 66. A set of(e.g., four) retention pins 81 stand on an upper surface on the baseplate 66. The retention pins 81 restrict the range of upward movement ofthe heat-receiving heat sink 32 elastically supported on the base plate66, and prevent a backlash.

A set of (e.g., four) attraction shaft members 72 each including anexternal screw member 72 a at the upper end projecting from the uppersurface of the base plate 66 and a pressure-receiving plate 72 b at thelower end projecting outward from a lower surface of the base plate 66are pivotally supported on the base plate 66 so that the verticalpositions of the attraction shaft members 72 are fixed. The attractionshaft members 72 are biased by the coil springs 73 to a rotationdirection in which the external screw members 72 a and thepressure-receiving plates 72 b always rotate clockwise in FIG. 5. Theexternal screw members 72 a are disposed to project from the mountsurface 34 a. When the portable information device 12 is mounted on thecooling device 11 and the base plate 66 elevates, the external screwmembers 72 a are engaged with the internal screw holes 75 formed in thebottom surface 16 a of the portable information device 12 (see FIG. 6).The internal screw holes 75 are holes in which spiral internal screwsare formed.

The up-and-down slide member 67 is a plate member that extendslaterally, and is slidable laterally on the inner surface of the devicechassis 33. The up-and-down slide member 67 slides under the lowersurface of the base plate 66, and is always biased to the left by abiasing force of an unillustrated elastic body so that the up-and-downslide member 67 is at the initial position illustrated in FIG. 5. Ribbedlift members 74 each having a slope 74 a that tilts downward toward thebase plate 66 are provided on an upper surface of the up-and-down slidemember 67. Each of the slopes 74 a of the lift members 74 is opposed toa corresponding one of the slopes 71 a of the pressure-receiving members71 on the lower surface of the base plate 66 at the initial position(unattached position) illustrated in FIGS. 5-6. A set of pressing plates67 a capable of pressing the pressure-receiving plates 72 b of theattraction shaft members 72 when the up-and-down slide member 67 movesforward are provided in side portions of the up-and-down slide member67.

The apparatus ejecting mechanism 54 is a mechanism part that drives theengaging levers 30 and the ejecting members 42 in detaching the portableinformation device 12 mounted on and connected to the cooling device 11.As illustrated in FIG. 5, the apparatus ejecting mechanism 54 includes asecond motor 76, an ejecting rack gear 77, a seesaw arm 78, and anejecting slide member 79.

The second motor 76 is an electric motor including a worm gear 76 a thatserves as an output shaft of the second motor 76 and is connected to theejecting rack gear 77 through a worm wheel 83. The ejecting rack gear 77is movable in a front-rear direction on the inner surface of the devicechassis 33, and is driven by the worm wheel 83 to follow the worm wheel83.

The seesaw arm 78 is a long arm member extending laterally, and ismovable in a seesaw manner around a seesaw shaft 78 a disposed atsubstantially the middle of the seesaw arm 78. The seesaw arm 78 has anend coupled to an end of the ejecting rack gear 77. The seesaw arm 78seesaws clockwise in FIG. 5 when the ejecting rack gear 77 movesrearward, and seesaws counterclockwise in FIG. 5 when the ejecting rackgear 77 moves forward. The other end of the seesaw arm 78 is coupled tothe ejecting slide member 79.

The ejecting slide member 79 moves in the front-rear direction inaccordance with seesaw movement of the seesaw arm 78. The ejecting slidemember 79 includes disengaging parts 79 a that move and disengage theengaging levers 30 and lift parts 79 b that lift the ejecting members 42by a pressing function of unillustrated slopes. The ejecting slidemember 79 moves forward when the seesaw arm 78 seesaws clockwise. Atthis time, the engaging levers 30 engaged with the engaging holes 31 aremoved by the disengaging parts 79 a to be disengaged, and then theejecting members 42 are lifted by the lift parts 79 b so that the bottomsurface 16 a of the portable information device 12 is lifted and theportable information device 12 is popped up on the mount surface 34 a.

As illustrated in FIG. 1, the on/off sensor 80 and the on sensor 64 asdetection units for detecting mounting of the portable informationdevice 12 and the on/off sensor 80 and the off sensor 82 as detectionunits for detecting detachment of the portable information device 12 areprovided on the mount surface 34 a of the cooling device 11.

FIGS. 7A-7B are side cross-sectional views illustrating a configurationof the on/off sensor 80. Specifically, FIG. 7A illustrates a state inwhich the portable information device 12 is not mounted on the mountsurface 34 a, and FIG. 7B illustrates a state in which the portableinformation device 12 is mounted on the mount surface 34 a. FIGS. 8A-8Bare side cross-sectional views illustrating configurations of the onsensor 64 and the off sensor 82. Specifically, FIG. 8A illustrates astate in which the portable information device 12 is not mounted on themount surface 34 a, and FIG. 8B illustrates a state in which theportable information device 12 is mounted on the mount surface 34 a.

As illustrated in FIGS. 1 and 7A-7B, the on/off sensor 80 is acylindrical member elastically supported on the mount surface 34 a andprojects upward from the mount surface 34 a. The on/off sensor 80 ispressed to transmit a predetermined detection signal (on signal) whenthe portable information device 12 is mounted on the mount surface 34 a,and returns to an original lifted position to transmit a predetermineddetection signal (off signal) when the portable information device 12 islifted from the mount surface 34 a.

An unlocking pin (unlocking unit) 84 is coaxially disposed in the innercylinder of the on/off sensor 80. Although specifically described later,the unlocking pin 84 is a member for unlocking a locking member (lockingunit) 85 (see FIG. 9) that locks the apparatus shutter members 27 and 28of the portable information device 12 to closed positions.

As illustrated in FIGS. 1 and 8A-8B, the on sensor 64 is an ellipticcylindrical member that is elastically supported on the mount surface 34a and projects upward from the mount surface 34 a. The on sensor 64 ispressed to transmit a predetermined detection signal (on signal) whenthe portable information device 12 is mounted on the mount surface 34 a.

The off sensor 82 is a cylindrical member that is elastically supportedon the on sensor 64 and projects from the upper surface of the on sensor64. The off sensor 82 projects above the on sensor 64, and detectswhether the bottom surface 16 a of the portable information device 12 islocated or not at a position higher than the on sensor 64. The offsensor 82 is pressed and buried in the on sensor 64 when the portableinformation device 12 is mounted on the mount surface 34 a, and returnsto an original lifted position to transmit a predetermined detectionsignal (off signal) when the portable information device 12 is liftedfrom the mount surface 34 a.

As illustrated in FIG. 5, the on/off sensor 80, the on sensor 64, andthe off sensor 82 are connected to a control unit 86 disposed in thedevice chassis 33 through signal lines indicated by dot-dash lines inFIG. 5. When receiving the on and off signals from the on/off sensor 80,the on sensor 64, and the off sensor 82, the control unit 86 suitablycontrols driving of the first motor 56 and the second motor 76 to causethe shutter driving mechanism 50, the up-and-down mechanism 52, theapparatus ejecting mechanism 54 to operate as appropriate.

In addition, in the device chassis 33, there provided a set of positiondetecting sensors 87 a to 87 c for detecting a position of the slidemember 58 and a position detecting sensor 87 d for detecting a positionof the ejecting rack gear 77. The position detecting sensors 87 a to 87c are arranged along a forward direction (to the right in FIG. 5) of theslide member 58, and detects a slide position of an end of the slidemember 58 coupled to the slide link 57 to transmit a predeterminedposition signal. The position detecting sensor 87 d detects rearwardmovement of the ejecting rack gear 77 to a predetermined position, andtransmits a predetermined position signal. The position signals from theposition detecting sensors 87 a to 87 d are transmitted to the controlunit 86, and are used for drive control of the first motor 56 and thesecond motor 76.

A cooling structure of the portable information device 12 will now bedescribed.

FIGS. 9A-9B are bottom views illustrating an internal configuration ofthe portable information device 12. Specifically, FIG. 9A illustrates astate in which the apparatus shutter members 27 and 28 are closed, andFIG. 9B illustrates a state in which the apparatus shutter members 27and 28 are open.

As illustrated in FIGS. 4 and 9A-9B, the portable information device 12includes the heat-dissipation heat sink 29 in the opening 26 formed inthe bottom surface 16 a so that the opening 26 provided with theheat-dissipation heat sink 29 can be freely covered and uncovered withthe apparatus shutter members 27 and 28.

The heat-dissipation heat sink 29 is a rectangular plate member made ofa metal material having a high thermal conductivity, such as copper oraluminum. As illustrated in FIG. 6, the heat-dissipation heat sink 29 isthermally connected to a heating body 90 that is an electroniccomponent, such as a CPU or a GPU, provided in the body chassis 16. Withthis configuration, heat generated in the heating body 90 is efficientlytransferred to the heat-dissipation heat sink 29.

As illustrated in FIGS. 9A-9B, one apparatus shutter member 27 coversand uncovers approximately a half of the heat-dissipation heat sink 29,whereas the other apparatus shutter member 28 covers and uncovers theother approximately half of the heat-dissipation heat sink 29. Theapparatus shutter member 27 is a U-shaped plate member including ashutter part 27 a for covering approximately a half of theheat-dissipation heat sink 29 and a rack gear part 27 b bent from theshutter part 27 a in a U shape. The other apparatus shutter member 28 isa U-shaped plate member including a shutter part 28 a for covering theother approximately half of the heat-dissipation heat sink 29 and a rackgear part 28 b bent from the shutter part 28 a in a U shape larger thanthe U shape of the apparatus shutter member 27.

The apparatus shutter members 27 and 28 are slidable in oppositedirections laterally on the inner surface of the body chassis 16. Atthis time, at least the apparatus shutter member 27 is biased by a coilspring 91 to the closed direction in which the shutter part 27 aapproaches the shutter part 28 a. The rack gear parts 27 b and 28 b ofthe apparatus shutter members 27 and 28 are engaged with theopening/closing gear 65.

Thus, when the opening/closing gear 65 rotates counterclockwise in FIG.9A, the apparatus shutter members 27 and 28 slide in open directions inwhich the shutter parts 27 a and 28 a of the apparatus shutter members27 and 28 move away from each other, against a biasing force of the coilspring 91. Consequently, the heat-dissipation heat sink 29 is exposed atthe bottom surface 16 a (see FIG. 9B). On the other hand, when a drivingforce (retaining force) to the opening/closing gear 65 is canceled froma state in which the apparatus shutter members 27 and 28 are open asillustrated in FIG. 9B, the apparatus shutter member 27 is caused tomove in the closed direction by a biasing force of the coil spring 91.At the same time, the apparatus shutter member 28 is caused to move inthe closed direction by a driving force from the apparatus shuttermember 27 that moves in the closed direction, through theopening/closing gear 65. Consequently, the heat-dissipation heat sink 29is covered with the apparatus shutter members 27 and 28 (see FIG. 9A).

An engaging hole 65 a with which the apparatus shutter operating member59 projecting from the mount surface 34 a of the cooling device 11 isformed at the center of the opening/closing gear 65. When the portableinformation device 12 is mounted on the cooling device 11, the apparatusshutter operating member 59 is engaged with the engaging hole 65 a (seeFIG. 8B) through an aperture 92 (see FIG. 4) formed in the bottomsurface 16 a. When the apparatus shutter operating member 59 rotates,the opening/closing gear 65 rotates accordingly, and the apparatusshutter members 27 and 28 at the closed positions become open.

The locking member 85 is disposed at the rear of the apparatus shuttermembers 27 and 28 to be slidable in the front-rear direction. Thelocking member 85 is a plate member having a substantially L shape inplan, and is always biased by a coil spring 93 forward (toward theapparatus shutter members 27 and 28). The locking member 85 includes aslope 85 a that is located at an end of the locking member 85 anddeclines forward and a restriction part 85 b that is located at theother end of the locking member 85 and has a right triangle shape. Arestriction projection 94 having a right triangle shape projects from aportion of a side surface of the apparatus shutter member 28 near theshutter part 28 a.

In a state in which the portable information device 12 is not mounted onthe cooling device 11 and the apparatus shutter members 27 and 28 are atthe closed positions illustrated in FIG. 9A, the restriction projection94 is stopped by the restriction part 85 b of the locking member 85 thatis caused to move forward by a biasing force of the coil spring 93.Consequently, movements in the open direction of the apparatus shuttermember 28 and the apparatus shutter member 27 that moves in conjunctionwith the apparatus shutter member 28 through the opening/closing gear 65are restricted, and the apparatus shutter members 27 and 28 are lockedat the closed positions.

When the portable information device 12 in this locked state is mountedon the cooling device 11 and the unlocking pin 84 of the cooling device11 is inserted in the aperture 95 formed in the bottom surface 16 a, thetip of the unlocking pin 84 presses the slope 85 a of the locking member85 (see FIG. 7). In this manner, the locking member 85 moves rearwardagainst the biasing force of the coil spring 93 so that the stopping ofthe restriction projection 94 by the restriction part 85 b (see FIG. 9B)is canceled. Consequently, the apparatus shutter member 28 and theapparatus shutter member 27 that moves in conjunction with the apparatusshutter member 28 through the opening/closing gear 65 are unlocked sothat movement in the open direction is allowed.

An operation of the cooling structure of the electronic apparatus 10will now be described.

First, in a state where the portable information device 12 is notattached to the cooling device 11, the heat-dissipation heat sink 29 iscovered with the apparatus shutter members 27 and 28 (see FIG. 9A), andthe heat-receiving heat sink 32 is covered with the device shuttermember 40 (see FIG. 5). Thus, a user does not erroneously touch any ofthe heat-dissipation heat sink 29 and the heat-receiving heat sink 32,and quality of external appearances of the bottom surface 16 a and themount surface 34 a can be sufficiently obtained. At this time, theapparatus shutter members 27 and 28 of the portable information device12 are locked by the locking member 85. Thus, in using the portableinformation device 12 alone, the user does not erroneously open theapparatus shutter members 27 and 28 with, for example, a finger, andexposure of the hot heat-dissipation heat sink 29 at the bottom surface16 a is prevented.

Next, in attaching the portable information device 12 to the coolingdevice 11 from the state described above, as illustrated in FIGS. 2-3,the extension connector 24 is connected to the apparatus connector 25,while the engaging levers 30 and the guide posts 41 are inserted intothe engaging holes 31 formed in the bottom surface 16 a of the portableinformation device 12. In this manner, the extension connector 24 iselectrically connected to the apparatus connector 25 and the engaginglevers 30 are engaged with the engaging holes 31, thereby preventingdetachment of the portable information device 12 from the cooling device11.

In this attachment, the on/off sensor 80 and the on sensor 64 arepressed by the bottom surface 16 a of the portable information device 12mounted on the mount surface 34 a (see FIGS. 7B and 8B). Consequently,the on/off sensor 80 and the on sensor 64 transmit on signals to thecontrol unit 86. Upon receiving the two on signals, the control unit 86turns the cooling device 11 on. As described above, the cooling device11 has a configuration in which the on/off sensor 80 and the on sensor64 are disposed to be separated from each other in the front-reardirection on the mount surface 34 a and when both of the sensors 64 and80 transmit on signals, the cooling device 11 is turned on. Thus, sincetwo on signals are not transmitted unless the portable informationdevice 12 is adequately mounted on the mount surface 34 a, it ispossible to prevent turn-on of the cooling device 11 with aninadequately tilt state of the portable information device 12, forexample.

When the on/off sensor 80 is pressed, the unlocking pin 84 penetratesthe aperture 95 in the bottom surface 16 a of the portable informationdevice 12 to move the locking member 85 in an unlocking direction, andthus, the apparatus shutter members 27 and 28 are unlocked (see FIGS. 7Band 9B). At the same time, the apparatus shutter operating member 59penetrates the aperture 92 in the bottom surface 16 a of the portableinformation device 12 to be engaged with the engaging hole 65 a of theopening/closing gear 65 (see FIG. 8B).

When the cooling device 11 is turned on, the shutter driving mechanism50 is first opened, and then, the apparatus shutter members 27 and 28and the device shutter member 40 are opened. That is, first, the firstmotor 56 is driven to rotate, and as illustrated in FIG. 10, the slidelink 57 moves forward from the initial position illustrated in FIG. 5 tothe right, and the slide member 58 also moves forward. Accordingly, thefirst pinion gear 59 a is caused to rotate by the first rack gear 58 athat is moving forward to follow the first rack gear 58 a, and rotationof the apparatus shutter operating member 59 causes the opening/closinggear 65 of the portable information device 12 to rotate (see FIG. 10).Consequently, the apparatus shutter members 27 and 28 are opened so thatthe heat-dissipation heat sink 29 is exposed at the bottom surface 16 aof the portable information device 12 (see FIG. 9B). At the same time,the second pinion gear 63 is caused to rotate by the second rack gear 58b that is moving forward to follow the second rack gear 58 b, and thedevice shutter operating member 60 is caused to move forward through theopening/closing rack gear 60 a (see FIG. 10). Consequently, the deviceshutter member 40 is opened so that the heat-receiving heat sink 32 isexposed at the mount surface 34 a of the cooling device 11.

Thereafter, the up-and-down mechanism 52 operates to elevate theheat-receiving heat sink 32. Specifically, driving of rotation of thefirst motor 56 continues from operation of the shutter driving mechanism50, and as illustrated in FIG. 11, the pressing part 57 a of the slidelink 57 that moves further forward contacts a corner of the up-and-downslide member 67 and presses the up-and-down slide member 67 whilekeeping in contact with the corner to move the up-and-down slide member67 forward. At this time, although the slide member 58 also movesforward, since the rack gears 58 a and 58 b are disengaged from thepinion gears 59 a and 63 as illustrated in FIGS. 10 and 11, the piniongears 59 a and 63 do not rotate.

When the up-and-down slide member 67 moves forward, as illustrated inFIG. 13, the slopes 74 a of the lift members 74 become in slide contactwith the slopes 71 a of the pressure-receiving members 71 of the baseplate 66 so that the base plate 66 is lifted against a biasing force ofthe coil springs 70. Accordingly, the heat-receiving heat sink 32elastically supported on the base plate 66 with the coil springs 68interposed therebetween also elevates, and a surface of theheat-receiving heat sink 32 contacts a surface of the heat-dissipationheat sink 29 of the portable information device 12 (see FIG. 13). Theexternal screw members 72 a also elevate together with the base plate 66to be engaged with the internal screw holes 75 in the bottom surface 16a of the portable information device 12 (see FIG. 13).

In the water cooling unit 48 mounted on the cooling device 11, the pipes47 connecting the heat-receiving heat sink 32 having a water coolingjacket structure and configured to move up and down, the radiator 44,and the circulating pump 46 are made of a flexible hose member 47 a (seeFIG. 13). Thus, the hose member 47 a can be flexible with respect toup-and-down movement of the heat-receiving heat sink 32, therebypreventing troubles such as water leakage.

Subsequently, as illustrated in FIG. 11, the pressure-receiving plates72 b of the attraction shaft members 72 are pressed by the pressingplates 67 a of the up-and-down slide member 67 that further movesforward to rotate against a biasing force of the coil springs 73 so thatthe external screw members 72 a rotate in the internal screw holes 75.Then, as illustrated in FIG. 14, the external screw members 72 a arescrewed into the internal screw holes 75 to move upward so that the baseplate 66 is also lifted by the attraction shaft members 72.Consequently, the coil springs 68 are compressed between the base plate66 and the heat-receiving heat sink 32, and the heat-receiving heat sink32 further comes to be in pressure contact with the heat-dissipationheat sink 29 so that the heat-receiving heat sink 32 and theheat-dissipation heat sink 29 are in close contact with each other. Thatis, the attraction shaft members 72 provided with the external screwmembers 72 a at the upper ends thereof cause the base plate 66 and theportable information device 12 to move close to each other, therebyfurther ensuring close contact between the heat-receiving heat sink 32and the heat-dissipation heat sink 29.

In a state in which the external screw members 72 a are screwed into theinternal screw holes 75 to a predetermined position, the external screwmembers 72 a are orthogonal to the openings of the internal screw holes75 as illustrated in FIG. 14. That is, when the external screw members72 a rotate by 90 degrees, the external screw members 72 a are screwedinto the internal screw holes 75. This configuration ensures preventionof detachment of the external screw members 72 a from the internal screwholes 75. Thus, even when an external force is applied to the portableinformation device 12 attached to the cooling device 11, close contactbetween the heat-receiving heat sink 32 and the heat-dissipation heatsink 29 is maintained.

Then, as illustrated in FIG. 11, when the position detecting sensor 87 cfor the slide member 58 detects that the slide link 57 moves forward toa predetermined forward position, the control unit 86 stops the firstmotor 56. In this manner, attachment of the portable information device12 to the cooling device 11 is completed. As a result, since theheat-dissipation heat sink 29 and the heat-receiving heat sink 32 are inclose contact with each other under a desired pressure with the coilsprings 68 interposed therebetween, high heat transmission performancebetween the heat sinks 29 and 32 is obtained so that the portableinformation device 12 can be efficiently cooled by the water coolingunit 48.

Thereafter, in detaching the portable information device 12 from thecooling device 11, the ejecting button 37 is turned on. Accordingly, thefirst motor 56 is driven to rotate in a direction opposite to thedirection in attaching the portable information device 12, and the slidelink 57 moves rearward to the left from the attachment positionillustrated in FIG. 11 to a position illustrated in FIG. 10, and theslide member 58 also moves rearward. At this time, the up-and-down slidemember 67 is also caused to move rearward by a biasing force of anunillustrated elastic body to follow the pressing part 57 a of the slidelink 57 that moves rearward.

When the up-and-down slide member 67 moves rearward, a pressure appliedfrom the pressing plate 67 a to the pressure-receiving plates 72 b ofthe attraction shaft members 72 is canceled. Thus, thepressure-receiving plates 72 b are caused to rotate reversely by abiasing force of the attraction shaft members 72 so that the externalscrew members 72 a rotate to be separated from the internal screw holes75. When the up-and-down slide member 67 further moves rearward, thelift members 74 are then separated from the correspondingpressure-receiving members 71 of the base plate 66. Thus, the base plate66 descends by a biasing force and a self-weight of the coil springs 70and, at the same time, the heat-receiving heat sink 32 also descends.Accordingly, the external screw members 72 a are completely separatedfrom the internal screw holes 75 (see FIG. 6).

As illustrated in FIG. 6, when the descending of the heat-receiving heatsink 32 is completed so that the slide member 58 moves to the positionillustrated in FIG. 10 and is detected by the position detecting sensor87 b, the control unit 86 stops the first motor 56, and the second motor76 is driven to rotate. Then, the ejecting rack gear 77 moves rearwardthrough the worm gear 76 a and the worm wheel 83 as illustrated in FIG.12, and the seesaw arm 78 seesaws clockwise in the drawing. In thismanner, the ejecting slide member 79 moves forward, and the disengagingparts 79 a disengage the engaging levers 30 from the engaging holes 31.Subsequently, the lift parts 79 b lift the ejecting members 42, and theportable information device 12 is popped up on the mount surface 34 a sothat the portable information device 12 is detached from the coolingdevice 11.

In this manner, when the portable information device 12 is detached fromthe cooling device 11, the ejecting rack gear 77 is detected by theposition detecting sensor 87 d so that the second motor 76 is stopped.

In view of this, by lifting and detaching the portable informationdevice 12 from the mount surface 34 a, the on/off sensor 80 and the offsensor 82 pressed by the bottom surface 16 a of the portable informationdevice 12 are lifted and return to initial positions (see FIGS. 7A and8A). Consequently, the on/off sensor 80 and the off sensor 82 transmitoff signals to the control unit 86. Upon receiving the two off signals,the control unit 86 causes the shutter driving mechanism 50 to perform aclose operation.

The cooling device 11 is configured such that the on/off sensor 80 andthe off sensor 82 are disposed at positions separated from each other inthe front-rear direction on the mount surface 34 a, and when both of thetwo sensors 80 and 82 transmit off signals, the shutter drivingmechanism 50 performs a close operation. Thus, since the two off signalsare not transmitted unless the portable information device 12 iscompletely detached from the mount surface 34 a, it is possible toprevent the shutter driving mechanism 50 from performing a closeoperation before the portable information device 12 is completelydetached. In addition, since the off sensor 82 can detect that theportable information device 12 is detached at a position higher than theon sensor 64, it is possible to prevent the shutter driving mechanism 50from performing a close operation in a state where the portableinformation device 12 is slightly lifted from the mount surface 34 a.

In the close operation of the shutter driving mechanism 50, first, thefirst motor 56 is driven to rotate again in a direction opposite to thedirection in attaching the portable information device 12, then theslide link 57 moves rearward to the left from the position illustratedin FIG. 10 to the initial position illustrated in FIG. 5, and the slidemember 58 also moves rearward. Accordingly, the first rack gear 58 athat is moving rearward causes the first pinion gear 59 a to rotate andfollow the first rack gear 58 a in a direction opposite to the directionin an open operation, and reverse rotation of the apparatus shutteroperating member 59 causes the opening/closing gear 65 of the portableinformation device 12 to rotate reversely. Consequently, the apparatusshutter members 27 and 28 are closed so that the heat-dissipation heatsink 29 is covered again (see FIG. 9A). At the same time, the secondrack gear 58 b that is moving rearward causes the second pinion gear 63to rotate and follow the second rack gear 58 b in a direction oppositeto the direction in an open operation, and the device shutter operatingmember 60 is caused to move rearward through the opening/closing rackgear 60 a. Consequently, the device shutter member 40 is closed so thatthe heat-receiving heat sink 32 is covered again (see FIG. 5).

In this manner, in the cooling device 11, after the heat-receiving heatsink 32 has descended, it is detected that the portable informationdevice 12 is certainly lifted and detached from the mount surface 34 a,and then the shutter members 27, 28, and 40 are closed. Thus, it ispossible to prevent the shutter members 27, 28, and 40 from beingerroneously engaged with, for example, the heat-receiving heat sink 32.

Finally, when the position detecting sensor 87 a detects that the slidemember 58 moves rearward to the initial position illustrated in FIG. 5,the control unit 86 turns the cooling device 11 off, and detachment ofthe portable information device 12 from the cooling device 11 iscompleted.

As described above, in the electronic apparatus 10 according to thisembodiment, the portable information device 12 includes theheat-dissipation heat sink 29 thermally connected to the heating body 90on the bottom surface 16 a of the portable information device 12 andalso includes the apparatus shutter members 27 and 28 covering theheat-dissipation heat sink 29 to freely cover and uncover theheat-dissipation heat sink 29. The cooling device 11 includes theshutter driving mechanism 50 that opens the apparatus shutter members 27and 28 when the portable information device 12 is connected to thecooling device 11 and also includes the heat-receiving heat sink 32thermally connected to the heat-dissipation heat sink 29.

Accordingly, in a state where the portable information device 12 is notconnected to the cooling device 11, the heat-dissipation heat sink 29provided on the outer surface (bottom surface 16 a) of the portableinformation device 12 can be covered with the apparatus shutter members27 and 28. Thus, it is possible to prevent the hot heat-dissipation heatsink 29 from being exposed at the bottom surface 16 a of the portableinformation device 12, and also to avoid impairment of quality ofexternal appearance of the portable information device 12 when theportable information device 12 is used alone. In addition, in a statewhere the portable information device 12 is connected to the coolingdevice 11, the shutter driving mechanism 50 of the cooling device 11opens the apparatus shutter members 27 and 28 so that the heat-receivingheat sink 32 is thermally connected to the heat-dissipation heat sink29. In this manner, the heat-dissipation heat sink 29 and theheat-receiving heat sink 32 can be brought into close contact with eachother in a wide contact area without another member such as a covermember interposed therebetween. Thus, sufficient heat transferefficiency can be obtained between the cooling device 11 and theportable information device 12, and the cooling function of the portableinformation device 12 can be enhanced.

In the electronic apparatus 10, the cooling device 11 includes, on asurface (mount surface 34 a) thereof, the heat-receiving heat sink 32and the device shutter member 40 covering the heat-receiving heat sink32 to freely cover and uncover the heat-receiving heat sink 32. Theshutter driving mechanism 50 opens the device shutter member 40. Thus,it is possible to prevent the heat-receiving heat sink 32 that isrelatively hot immediately after detachment of the portable informationdevice 12, for example, from being exposed at the mount surface 34 a,and also to avoid impairment of quality of outer appearance of thecooling device 11 when the cooling device 11 is used alone.

In particular, the electronic apparatus 10 includes the up-and-downmechanism 52 that elevates the heat-receiving heat sink 32 to bring theheat-receiving heat sink 32 into contact with the heat-dissipation heatsink 29 after the portable information device 12 has been mounted on themount surface 34 a of the cooling device 11. This configuration ensuresclose contact between the heat-receiving heat sink 32 and theheat-dissipation heat sink 29 even with the presence of the apparatusshutter members 27 and 28 and the device shutter member 40. Theconfiguration including the apparatus shutter members 27 and 28 and thedevice shutter member 40 as described above may, of course, not includethe up-and-down mechanism 52 in the cooling device 11, but may includean up-and-down mechanism that causes the heat-dissipation heat sink 29to descend in the portable information device 12, for example.

In this case, the cooling device 11 includes the water cooling unit 48in which the radiator 44, the heat-receiving heat sink 32, and thecirculating pump 46 are connected to one another in a loop by the pipes47 so that cooling water circulates. Thus, the cooling device 11 canefficiently cool the portable information device 12.

In the electronic apparatus 10 according to this embodiment, theportable information device 12 includes the heat-dissipation heat sink29 disposed on the bottom surface 16 a of the portable informationdevice 12 and thermally connected to the heating body 90. The coolingdevice 11 includes the mount surface 34 a on which the bottom surface 16a of the portable information device 12 is mounted, the heat-receivingheat sink 32 disposed on the mount surface 34 a and thermally connectedto the heat-dissipation heat sink 29, and the up-and-down mechanism 52that elevates the heat-receiving heat sink 32 toward theheat-dissipation heat sink 29 when the portable information device 12 ismounted on the mount surface 34 a.

Thus, after the portable information device 12 has been mounted on themount surface 34 a of the cooling device 11, the heat-receiving heatsink 32 elevates to contact the heat-dissipation heat sink 29. Thisconfiguration ensures close contact between the heat-receiving heat sink32 and the heat-dissipation heat sink 29, thereby obtaining high heattransfer efficiency.

In particular, in the electronic apparatus 10, since theheat-dissipation heat sink 29 of the portable information device 12 andthe heat-receiving heat sink 32 of the cooling device 11 are coveredwith the apparatus shutter members 27 and 28 and the device shuttermember 40, respectively, it is difficult to bring the heat-receivingheat sink 32 and the heat-dissipation heat sink 29 into close contactwith each other only by mounting the portable information device 12 onthe mount surface 34 a. In view of this, the electronic apparatus 10 hasthe configuration in which the shutter driving mechanism 50 opens theapparatus shutter members 27 and 28 and the device shutter member 40 andthen the up-and-down mechanism 52 elevates the heat-receiving heat sink32 to bring the heat-receiving heat sink 32 into close contact with theheat-dissipation heat sink 29. Thus, it is possible to ensure closecontact between the heat-receiving heat sink 32 and the heat-dissipationheat sink 29 even with the presence of the apparatus shutter members 27and 28 and the device shutter member 40. The thus-configured up-and-downmechanism 52 may, of course, not include the apparatus shutter members27 and 28 and the device shutter member 40. In this case, theup-and-down mechanism 52 can be effectively used.

The present invention is not limited to the embodiment described above,and can be, of course, freely changed without departing from the gist ofthe invention.

In the example of this embodiment, the portable information device 12and the cooling device 11 include the apparatus shutter members 27 and28 and the device shutter member 40. Alternatively, as long as theportable information device 12 that can be used alone includes theapparatus shutter members 27 and 28, for example, the cooling device 11may not include the device shutter member 40. The apparatus shuttermembers 27 and 28 are not necessarily provided as a pair, and only oneof the apparatus shutter members 27 and 28 may be used in a mannersimilar to that of the device shutter member 40.

In the configuration of the embodiment described above, the coolingdevice 11 includes the water cooling unit 48. Alternatively, the watercooling unit 48 may be replaced by an air cooling unit.

As has been described, the present invention provides a cooling devicefor cooling a portable information device.

While the invention has been particularly shown and described withreference to a preferred embodiment, it will be understood by thoseskilled in the art that various changes in form and detail may be madetherein without departing from the spirit and scope of the invention.

The electronic apparatus 10 includes: a portable information device 12including a heating body 90 therein; and a cooling device 11 detachablyconnected to the portable information device 12 and configured to absorbheat from the heating body 90. The portable information device 12includes a heat-dissipation heat sink 29 disposed on a bottom surface 16a of the portable information device 12 and thermally connected to theheating body 90. The cooling device 11 includes a mount surface 34 a onwhich the bottom surface 16 a of the portable information device 12 ismounted, a heat-receiving heat sink 32 disposed on the mount surface 34a and thermally connected to the heat-dissipation heat sink 29, and anup-and-down mechanism 52 that elevates the heat-receiving heat sink 32toward the heat-dissipation heat sink 29 and causes the heat-receivingheat sink 32 to contact the heat-dissipation heat sink 29 when theportable information device 12 is mounted on the mount surface 34 a.

What is claimed is:
 1. An electronic apparatus comprising: a portableinformation device having a heating body, wherein said portableinformation device includes a heat-dissipation heat sink disposed on abottom surface of said portable information device and thermallyconnected to said heating body; and a cooling device detachablyconnected to said portable information device and configured to absorbheat from said heating body, wherein said cooling device includes amount surface on which said bottom surface of said portable informationdevice is mounted, a heat-receiving heat sink disposed on said mountsurface for thermally connecting to said heat-dissipation heat sink, andan up-and-down mechanism that moves said heat-receiving heat sinktowards said heat-dissipation heat sink to bring said heat-receivingheat sink into pressure contact with said heat-dissipation heat sinkwhen said portable information device is mounted on said mount surface.2. The electronic apparatus of claim 1, wherein said cooling deviceincludes a water cooling unit in which a radiator, said heat-receivingheat sink, and a circulating pump are connected to one another in a loopby pipes so that cooling water circulates.
 3. The electronic apparatusof claim 2, wherein a flexible hose member is used as a pipe connectedto said heat-receiving heat sink.
 4. An electronic apparatus comprising:a portable information device having a heating body, wherein saidportable information device includes a heat-dissipation heat sinkdisposed on a bottom surface of said portable information device andthermally connected to said heating body; and a cooling devicedetachably connected to said portable information device and configuredto absorb heat from said heating body, wherein said cooling deviceincludes a mount surface on which said bottom surface of said portableinformation device is mounted, a heat-receiving heat sink disposed onsaid mount surface and thermally connected to said heat-dissipation heatsink, and an up-and-down mechanism that elevates said heat-receivingheat sink towards said heat-dissipation heat sink to bring saidheat-receiving heat sink into pressure contact with saidheat-dissipation heat sink when said portable information device ismounted on said mount surface, wherein said up-and-down mechanismincludes a base plate elastically supporting said heat-receiving heatsink with an elastic body interposed between a top surface of saidup-and-down mechanism and said base plate and a lift member that liftssaid base plate.
 5. The electronic apparatus of claim 4, wherein anexternal screw member configured to be engaged with an internal screwhole disposed in said bottom surface of said portable information devicewhen said portable information device is mounted on said mount surfaceis pivotally supported on said base plate.
 6. The electronic apparatusof claim 4, wherein said cooling device includes a detection unitconfigured to detect that said portable information device is mounted onsaid mount surface.
 7. The electronic apparatus of claim 4, wherein saidup-and-down mechanism includes a motor that is driven to rotate saidexternal screw member when said detection unit detects said portableinformation device.
 8. The electronic apparatus of claim 4, wherein adriving of said motor causes said external screw member to be screwedinto said internal screw hole so that said heat-receiving heat sink ispressed against said heat-dissipation heat sink through said base plate.9. The electronic apparatus of claim 8, wherein said base plate islifted by said lift member before said external screw member rotates.